Bushing for electrical conduits.



Patented Oct. 7

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BUSHING FOR ELECTRICAL CONDUITS.

(Application filed Feb. 17, 1902.)

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q vitmowb @Ywm Qm Danni/mm UNITED STATES PATENT OFFICE.

MATIIIAS MAUER AND \VILLILNI J. BILLINGS, OF NE\V YORK, N. Y.

BUSHING FOR ELECTRICAL CONDUITS.

SPECIFICATION forming part of Letters Patent No. 710,488, dated October 7, 1902.

Application filed February 17,1902. berial No. 94,348. (No modcld To (LZZ whont it may (2011410771 Be it known that we, MATHIAS MAUER and WILLIAM JAMES BILLINGS, citizens of the United States, residingin the borough ofManhattan, city of New York, county and State of New York, have invented new and useful Improvements in Bushings for-Electrical Conduits, of which the following is a specification.

Our invention relates to improvements in bushings for outlet-boxes and electrical conduits and means for readily uniting and separating the several related parts; and the ob jects of the invention are to provide a cheaper and more simple bushing for such boxes and conduits and a more convenient, economical, and speedy method of securing the several parts concerned together and in separating the same.

The invention and its method of operation are set forth in this specification and in the accompanying drawings, and the invention is more particularly defined in the claims annexed hereto.

\Ve attain the objects of our invention by the mechanism illustrated in the accompanying drawings, in which- Figures 1 and 2 are longitudinal sectional views showing a part of the side of the box, a part of the associated conduit-pipe, and the bushing by which they are connected and held together, the sectional View being cut on the lines of corresponding numbers shown in Figs. 3 and 4. Figs. 3 and 4 are horizontal sectional views cut on the lines of corresponding numbers shown in Figs. 1 and 2, respectively. Fig. 5 is a plan View of a part of the side of a box and an aperture or open ing therein that shows three camshaped outlines and bearing-surfaces. Fig. 6 is a side View of a concentric bushing. Fig. 7 is a bottom View of the same, and Fig. 8 is in part a plan view of a part of the side of the box and in part a horizontal sectional view of the concentric bushing in place in the side of the box.

Similarletters refer to similarparts throughout the several views.

B is the concentric bushing.

C is the perforated or apertnred side of an outlet-box for an electrical conduit, and P is an electrical conduit-pipe, which is related to the sides of the box by the bushing.

The plate or side 0 of the outlet-box is per forated with the aperture or opening O,which, as shown, has three cam-shaped outlines. While the opening 0, as shown, has three cam-shaped outlines, it may have only one such cam-shaped outline or any other desired number, the other parts of the outline being made concentric to correspond with the concentric outline of the bushing l and the concentric bushing l; is provided with three corresponding concentric extensions, spurs, tongues, or projections E, so formed as to be yielding and so shaped as to pass readily into the cam-shaped spaces S in the opening 0, and they may be one or more in number, accordingly as may be desired. In Fig. 8 these spurs or projections E are shown in sectional View in position and occupying thelargerend of the cam-shaped spaces S and in dotted line in the position to which they will be carried by the proper movement of the bushing to bind the parts together. These two positions (indicated in Fig. 8) show the unlocked and the locked positions, respectively, with the parts otherwise in position, but without the conduit-pipe P shown. In the sectional views, Figs. 3 and 4, all three of the parts are shown, in Fig. 3in the locked position and in Fig. 4: in the unlocked position, the two together clearly indicating the slight amount of movement required for looking the parts together or for unlocking them, so that they can be separated.

We do not desire to confine our invention to the precise form and division of parts of the concentric bushing B, as other concentric forms in corresponding relation to the cam-shaped surfaces in the opening 0 may be used without avoiding our invention.

We claim as our invention 1. In an outlet-box and in combination, a concentrically-formed bushing and an eccentrically-formed aperture as shown and for the purposes specified.

2. In combination with an outlet-box of a pipe leadinginto such box, a concentric bushing and an aperture in the side of the box that presents an eccentrically-formed bearing and engaging surface to the concentric bushing therein,substantiallyas shown and described.

3. The combination in an outlet-box of a concentric bushing, an eccentrically-forined aperture to receive the bushing and an electrical conduit-pipe, all so arranged as to cause a locking action and eifect when the bushing is rotated in the aperture, inthe manner and for the purposes specified.

4. The combination in an outlet-box of a concentric yielding bushing, an eccentricallyformed aperture to receive the bushing and an electrical conduit-pipe, all so arranged as to cause a locking action and eifect when the bushing is rotated in the aperture, in the manner and for the purposes specified.

5. The combination in an outlet-box of a concentric bushing provided with one or more yielding spurs or tongues, an eccentrical1yformed aperture to receive the yielding spurs or tongues of the bushing and an electrical conduit-pipe, all so arranged as to cause a locking action and effect when the bushing is rotated in the aperture, in the manner and 20 for the purposes specified.

MATHIAS MAUER. WM. J. BILLINGS.

Witnesses:

JAMES A. SKILTON, JOSEPH A. DURKIN. 

